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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3c4d16b4c8bd20cc01dce686ee821224b89e3bf0804ea235be4da7ebaaec679' 
  AND token = 'H6xxwHMFPPz4j/ycN22JmFSAnUnEM1vpr1uk4u7I4Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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