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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3cb23a64b668df537e4cb12fc88704454bcbfe375514b7cf00d0f1d43e06afa' 
  AND token = 'bpjL9OgWXQ/ofMQTMwdKDSvvgW2fUpk3tjHep/vkmYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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