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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b0bfbfe7b0357e50856bbb8a4a534ea7d348aaf4f4deb5d59cd23ebca00e527' 
  AND token = '6ELN50Ph0UG4c1RHtA3XoCKqVbAF5/TE18zpthLhTs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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