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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a58567a33749143ae7284acf2ef6e6edb9cab0c6b489fc79c64069b4513c3a8' 
  AND token = '7Y++XmfADP6HiuhAtqsKk1jG8Ug996bA0DU8N8LgJMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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