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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc730a004762bd6ddb017d6538addd972d730aaa31c5f7757dbc39e389475a1a' 
  AND token = 'cDP8MSzjEDmCT9HkOk4UBMq3ObD5QxDASWduFJYa/ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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