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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b422b428dca07de6d7c91c0dcd9926d417efbe9d8b27c883e73c9ccdc45d9494' 
  AND token = 'K8mjLmparwXCpR+vGAUhw/Qs+1cSOa8p7/6d9LrVgCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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