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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf8ec2bb04454df1a43c8f8e42cc850a0bd2bcd205ffba28354ca08aa5c21d94' 
  AND token = 'zvA7NpldrEFX4oa2+TKM1XzdlnVR+riqWcrbBm7VYAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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