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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f96ebf6e58db4a988d2a3988bfe267e2dc81c213c2fe7d3e396882244b1ac11' 
  AND token = '+A1M4yO016gVa/gminN1Gjr2bTobnRVrNSxCeZZdqok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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