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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf94c119c1af0b4a219aad4718b00bbe9988336c2c6ae8a8e9dd5d76b33a8e26' 
  AND token = 'hM7I2HkSo09GBctgcc5rEE+VDZEPHmQpX8UslfO9Ixk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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