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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48abddd6c417f4eb2e3df6e5b84f36467284379a44a2b5bfad8b424d632d8f48' 
  AND token = 'BbM0uv6cxykDJy48H7iHnF3URTqkfZaOHU2V+e0K8Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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