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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f92a51196cca8973a248660d33252cc95e0d41d494306fecc605abdaeb8024fc' 
  AND token = 'qJNf27y4bxSTyScsEvOyzMwKKrHdbJ1ID+WGn2YDOms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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