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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd52dd29ced24c416e3d8ed39c48e9b1f39766af8dee424c5ecb731126bf52dc' 
  AND token = 'J5cs6g9aUfN9BC+1kMeXsWTuFAWHoSZNTXecg5nRjrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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