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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67f6fd210e135b2bcd8ae1840aa8021a30d10cf9cc0a9b5c3a9001be6139cd92' 
  AND token = 'o5/jemoejhaF9epowUcn19ZUqKHBoVjDq/k86EcJITs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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