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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6515520215f1a19216c36a57178a4321c1a025d594eb9c8ec9e1621aff6df932' 
  AND token = '45pY80+JG325HPuXNul4ZwEYYCXtWsphbXOsppME7ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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