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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ced4cdd3685d32754e4a45c9bf9c569a5bd2963daac51eb0a3f9f1c95191bcc' 
  AND token = 'P4OufAikGalOmt/62XRYi3DGFgYUtsXKa6yD1zBgNk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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