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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40e244cceb3a5f4cee9e077ea3adc3ee271d3bffa6610a10c18e040d181b6c59' 
  AND token = 'vmr6iYIQHCphxHl9j/6zqROI1jpRv5zp9KoGUeI4cV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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