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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4c7d272793e4b519d7262693e7a8ce6b80dfa4d4d6e342b69ea657fd59f982a' 
  AND token = 'hT58s0jfID0rIBTJwa601ERH7zjzMW4UwSpl6tUROvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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