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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ab28c7b5cffe06d0ffa1f81a3e8634f55f7767571d73dadbca8224df4f9e5be' 
  AND token = 'YvW2MnpmdHJl1iXQSoF/cn7sf16BioGteSspP/hqPtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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