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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b67027684e656b74994d18a1bd92cdb4aeda3c46eceb85c0e00f679750dc3b3' 
  AND token = 'uAkBIICMd9bO7F//klnjb6dSr99VY+2Dh/3RTF5jvXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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