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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85ea42bef0392a933f713f0d8b3c94136f020329a58ba4ecea84f405f81a53a8' 
  AND token = '9AuiANy9ByHOOf6LdeKKrmT3vB5144cuKgP/LIxpAXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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