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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3156f2aee4a02aa0663316be5740b4d31180f9a6370cd84ce3fff55406853314' 
  AND token = 'W9IDOeGNHT+dKZAgx3zkUrVkR2OBUsCZ2I55a90uBOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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