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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ceb21780e7e7b8285a1826a14e6e3adfd1e997a9bd46f8f94b5ac13dc7f7adf0' 
  AND token = 'r/B9FsAgFSP9x8F+H4asaniEQdOEzi/GbGrIxUTOgRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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