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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78d49f6a6422d10f7d41764b905aa2f1af8a1782b6c3f8873493c7396bbeaf30' 
  AND token = '72p+44SbdjXRKaSBl4NI90LythrC+/uRpOnp7TEyvCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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