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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c07517e55889423075b17aa5f1dc8821dc9f0737494267ca411c9f5b9548439d' 
  AND token = 'U/vQU0TQmKCYTwLr0lYQXKA7cn1Kc1psiP1jA29bqVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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