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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef8ecb8d1921812771b83e89dc94f3c9fabb5176651fe6e22a7e7c62f129c54d' 
  AND token = '0u6gp5STmAd8I4fCnHR9wW5evdISL4sgORfqIF44N5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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