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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8eec6aeffffd8491a5264820c26946adeff7529b022850b39d6dc0bb2111225a' 
  AND token = 'nhs82MSC06/Z0O59B3BpRdoJ9/Q/EG8HWxADPC0n/ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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