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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f70c9fdfd877ea164156503039ace8cb918d459076e8fddde32d16f379ed179' 
  AND token = '5qttL6wj3goTze89b4ky+ZW5cVW+Vxq/L+6HwSeCsE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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