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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1fda75f8f754a0f0773def8b19b72d85f0946ebd52a8334ee10322eb825a9b5' 
  AND token = 'tTjAUC5TZLTmb3ROR3IDzoUVFNxi9antWjhv2WKIiz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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