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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4613fd7bfe5e9530751cb1be50998631e2c6b4d263fadffe93137c0b32d8c65b' 
  AND token = 'UagcxZeFNlr89BcByJbrOIjeQVktqXbLkTEBH6aV6uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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