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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3dce314a9535edb73b2ca7f69326d6c3e1a304fc946067674f28ee2cf35f163' 
  AND token = 'KTQYn5iM3FJtfgp/sL4kXOTMuUab7YwYErPWX0TIO4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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