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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe3c4874cc28914525c97861da526159b8738b036f6b328d987ea8648281db0d' 
  AND token = 'CrI6AtpppbYsVW/XZx3+EIe8sAyTp41c337u2mB5MTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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