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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'beb143cdb387d752e6ceaa7f045cb95b52fd16c0ed8916186b8289152f9db7c9' 
  AND token = 'MziiJAzle3lkUhXYGiZ+HUv2Wy5OtOdAj6TNivR3H+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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