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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64b5f6a1ae21cc075e4e3f25fb8d1283d7828f3687e3b8f6acfb929a22c9716d' 
  AND token = 'deju49+rxrX7/aZQBkHFcsIHq2cRvudOvVog8WrxS8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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