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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f14663c368cc9d4d9d7a775a9076143f7988f0fc49f92ef3e0d0e46a4f5df61a' 
  AND token = 'yWK5hvZaEKpX5qGD3IzO95lclENIxq5rWnOQoF1NnsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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