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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af53ffdb70710900f3dce9efa37e707d9a1f93e3966dcabe37c094a71c23064c' 
  AND token = 'qPdFx28CieTpb8pump/YwWzxHVDyY5ey1oTsDyME0cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}