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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e95fc56fb90c03028c13dacc3513efa3a38644dceb249210a795f6de3549585' 
  AND token = 'psqXEIt6KDUa5m6A4FXrV9Hjtg22+xZMKNFGHRSirkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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