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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f81c7d468b03d2304e654613653a73a4bee0c3629956437fb172455969ccd22' 
  AND token = 'HQ31dd8S4YNe8cW1M2BSKo9zTBf76r2zNHBiNaIH7dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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