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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc8bff564ed84ccdce63f8a1a6309347507b7892303528c820a02d4f968eccaa' 
  AND token = 'k0nfix2ZXcti9liT7bxbvRm1ve6pRuHYi/o8QkghCxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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