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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb3c81798ad52ee9385cc96145730a96bc30dc1c12dca278a568deb5b1a7ca7b' 
  AND token = 'gzzeIyFiYze4aEnHxWEoKSHqtpzwYX7ZTnymEAiphY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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