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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '462d92b2e60c12fa5566d67735bf3e6c708ad0e38ad983d650ba420bce5fcb2d' 
  AND token = 'N0Vo3AZAb3LcmbIuCFq6kHugAvJSpGWasfZp3T6lyd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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