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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fd16befddfc63ec2749d5cb551837d1b87e9c347123b811205fd52f912f78e0' 
  AND token = 'Lk58XoMb1wV2kN2o5EdYWl2ricHe1F3kElEWZuPYw2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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