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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fdde56ca9dc155a007c25ab4cf3b4c3e9672115a7a844783ce75ac4d1dc63f1' 
  AND token = '+DLJ4xlizjIbkrhhePEDKHG56aQ9TCBGgTe0jC4SqEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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