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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa1ccf78f6a23ca29dd7267680f111cab3f43dd648ca4726c2d2e8a1d3792ab2' 
  AND token = 'YLsCp1FY+TfZmHoJjaVlucdzDj+mjsS+IeUHNmteUB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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