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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4d75127dff033a4229e3117b3e61c5ed9a2049c7ef6a731fe7586e3cc8cbccc' 
  AND token = 'f8E2am7ovMwc+xhJb9yhskF36+hnBqt/vs6tp7RbqRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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