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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b56f380df280e62e12a1607fcd1bf70c6c89c021733924e2f704095d19db5e42' 
  AND token = '6noHDnLNJCdHsr8h2oeoITCx3KWMoHqceU/xEfecvkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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