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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8aa7d17c073d7d0f9bf0ab2b6fe5d965fd5b1e3ece73fc034e6a3e1ec69cf166' 
  AND token = 'kRh37Ff7xHeJbdz8wLknv117QOLcPFwhHtvTx+Lc6lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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