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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd5b208532297708bfe8d6b4b9b6ce8f8d9385c1e90ac79193d13f9e809db63c' 
  AND token = '/9usmzUR2DKFkLfHXB8C8VTng2zdYckhX610r4G53dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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