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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fde0971beafb7e3d6d8b7209bfaf6d0779587ac742b4feb936dcd62c629d1b76' 
  AND token = '7ybzYh0pXEH/e03l5bB3Md8rWXYamptVDzzDCDBmhTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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