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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd61122b238f1bd237a79551623fcfde607e9f4786d60657db780c08e3c4458ae' 
  AND token = '4CoHO/Ej8WM8ULPsv8p3WL91j2feBo0jsr1y+YQFdso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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