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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a3bf8951ea629cf633bd5d78b8e2e697d378da6cc74b84adb535f9ad1c3fdce' 
  AND token = 'Gl9Fpmru+29jHy90jkRDRCPEfUz1D2hZj0hmdCUr8Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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