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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c82c27354adbf07bf9bd07fb5171e5b46038ab85d43e65c9de24780f05d853d' 
  AND token = 'MaIII30liYXUKT1Gwtm8n0dFD1fq0Zzfi5qpUlx2iAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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