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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2d2faaa38e8287ca4d3bcc859096338b03e15c776417af44e14cdcec260ae5e' 
  AND token = 'mJcrEMCsxRC8fmzjy7okphXI6R4mhipBf/WN+qqAuZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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