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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b03ec406b0cdf2619ae7511ada82d9b9725417690dce1075d74a0367a5bd032' 
  AND token = 'IsSN0yNVtv1k88DHTiAkLly5o1V8Z0aY6DZVxQuahDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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