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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaee64e073a68fc2a58d24406b4e18e3e32261f7c958c565f7604a5da74d30e3' 
  AND token = '/dFg855ISawDPvhTFkfH7+W0BYM/Dr/PaLBMNJ6VNXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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