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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3553d5d9526ef40f49422f68de2a16f1cdd05526a48349c3828fb51b6d1fff73' 
  AND token = 'jkYMFJL9GsWCfupq3coNgWfMLZYtpH64Dxiyvds3LQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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